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About totalitor

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    SSTO for fun

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  1. Welcome to follow small rocket engine testing and rocket building on my youtube channel. Any suggestions to get more thrust or saving weight on rocket are welcome! Check it out.
  2. Yes better to be safe than sorry. In my tests I am 10 m away behind 15 cm thick wood and still I look rocket engine from mirror. It is nice to see what happen when you are testing but you sure look many times videos after tests. That is more important to analyze what happend during test. Good luck to your next version. I have collected parts to my rocket, I am planning if I can get it to fly next year. Now I have 3500 grams together including engine, pressure regulators, fuel. gaseous oxygen and other sfuff. Not including stability system and recovery system. Best thrust is so far 3400 grams so there is still work - this rocket can not fly yet. Cutting weight is important but I think I have done everything I can. Ok, I have "not-so-safe-system" weight 3300 grams but there is no check valves. I am hoping to get more thrust with more pressure. Next real test begin when spring arrives - on May I think.
  3. Nice work! I think O/F ratio is good, not too much fuel. I think my engine is more fuel rich. And your engine has 20 times more thrust. Great!
  4. Average thrust 41,6 N? Is that right? TWR=33? Sounds incredible. Use more cameras when you are testing. This IS science!
  5. I think creator of this post have gave up, for many reasons I think. But he inspired me and I kept going. Now I have a small working rocket engine and next year I try to build a flying rocket. Hopefully. ap0r - are you still there?
  6. New engine RUD-12, new test. Better injector, does it increase thrust?
  7. New engine: RUD-11 with regenerative AND film cooling. How much film cooling eats thrust? Answer: a lot. Videos here:
  8. New test today. More pressure - more thrust? Look what happened. Same engine, same test platform. Thrust in earlier test 29 N (3 kg)
  9. Not quite. Isp=F/W total. If I assume O/F ratio was 1 then W total=2*0,038 lb/s=0,076 lb/s So Isp=6,61/0,076=87. That is bad. I try to raise combustion chamber pressure next time.
  10. I installed a thrust measurement system and did two test run with bigger fuel tank. Thrust is 29 N (3 kg). I expected more but this engine may have low isp or there is not enough pressure in combustion chamber. 11 seconds burning time with 190 grams of fuel. Engine weight is 180 grams (without any fittings) so TWR=16,7. Fuel is alcohol 70 % water 30 %. Videos here (RUD-10 test 9 and RUD-10 test10).
  11. Great day today! I test fired my homemade rocket engine four times and it is still alive. My goal is to have total 10 seconds thrust without melting. Last run no. 8 was very good. Tank wasn't full becouse I ran out fuel mixture but still I got a record 7 seconds. After test the engine wasn't too hot, I think cooling works well (sure, it doesn't melt...) Here are videos:
  12. Yes I have to design thrust measuring system. Then I know better.
  13. What is the best test run? 2-3 or number 4? Mach diamonds looks nice but is there too little fuel and so more temperature in combustion chamber?
  14. Ok to be clear: fuel is a mixture which contains 80 % alcohol and 20 % water. Better?